ElevenThe "Eleven" is our Uno-equivalent Arduino-compatible board, but with a number of improvements including prototyping area, a mini-USB connector, LEDs mounted near the edge, and the D13 LED isolated using a FET. [Product page]

Pebble v2The Pebble is an Arduino-compatible board with a bunch of built in sensors and other devices, including support for ZigBee wireless mesh networking. Great for datalogging or general experiments.